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61,005 resultsShowing papers similar to Numerical simulation and experimental study of microplastic transport under open channel shear flow: Roles of particle physical properties and flow velocities
ClearContinuous Near-Bed Movements of Microplastics in Open Channel Flows: Statistical Analysis
Particle tracking velocimetry experiments in a laboratory flume showed that near-bed microplastic transport in open channels follows a normal streamwise velocity distribution, with transport behavior varying significantly by particle type and hydraulic conditions.
Impact of the Reynolds Numbers on the Velocity of Floating Microplastics in Open Channels
Researchers experimentally tracked the motion of nearly spherical polyethylene, polypropylene, and polystyrene microplastics in open channel flow using video analysis, establishing quantitative relationships among Reynolds number, MP density, and floating velocity to better predict horizontal transport behavior.
Investigation of the Sheltering Effects on the Mobilization of Microplastics in Open-Channel Flow
Researchers investigated how bed grain sheltering affects microplastic mobilization in open-channel flow, developing improved formulas for predicting the critical shear stress needed to move microplastic particles of various materials and densities.
Dynamics of microplastics bedload transport in turbulent open channel flows over smooth and rough beds
Researchers developed novel empirical formulas for predicting bedload transport layer thickness and velocity of microplastics in turbulent open-channel flows using 80 controlled flume experiments across diverse particle types and flow conditions. The new formula for bedload layer thickness reduced prediction error by 75% compared to existing sediment-based formulas, demonstrating the critical role of particle density and bed characteristics in shaping MP transport dynamics.
Incipient Motion of Exposed Microplastics in an Open-Channel Flow
Researchers experimentally determined the conditions needed to initiate microplastic movement in open-channel water flows, finding that standard sediment transport thresholds do not apply to microplastics and proposing a new predictive formula that reduces error from 55.6% to 12.3%.
Plastic drift : Mapping the course of microplastic transport in turbulent riverine flows.
Researchers conducted laboratory experiments tracking the 3D trajectories of 24 negatively buoyant microplastic particles spanning a range of sizes, shapes, and densities in turbulent open channel flow, generating 720 trajectories to evaluate how well conventional sediment transport models apply to microplastics. Results revealed that the inherent variability in microplastic physical properties challenges direct application of sediment transport concepts to microplastic fate prediction in rivers.
Bedload transport rates of microplastics on natural sediments under open channel flow: The role of exposure in acceleration
Researchers developed a new model for predicting how microplastics are transported as bedload in rivers, combining computational fluid dynamics with laboratory experiments. They found that exposed microplastics on the sediment surface move at higher transport rates than natural sediment particles of similar size, potentially spreading contamination over wider areas. The model provides a practical tool for engineers assessing how microplastic pollution disperses through waterway systems.
Computational Analysis of Microplastics Hydrodynamics in Laboratory Experiment
Researchers conducted computational simulations of microplastic hydrodynamics in an open channel using OpenFOAM with turbulent flow modelling, validating the simulation against laboratory experimental results and examining how particle properties influence settling behaviour.
Computational Analysis of Microplastics Hydrodynamics
Researchers developed a numerical model in Python and OpenFOAM to simulate microplastic particle dynamics in laminar open-channel flow, finding that particles smaller than 0.5 mm are unlikely to settle regardless of sphericity index, with results validated on a supercomputer.
A Laboratory Dataset on Transport and Deposition of Spherical and Cylindrical Large Microplastics for Validation of Numerical Models
This paper presents a laboratory dataset on the transport and deposition of spherical microplastic particles under controlled flow conditions, providing empirical data on how particle size and flow velocity influence settling and lateral dispersion. The dataset is intended to support calibration of microplastic transport models.
Transport dynamics of microplastics from land to sea: the role of particle properties and stream morphology.
Researchers measured how particle properties including size, density, and polymer type interact with stream morphology to determine microplastic transport distances in 15 streams. Both plastic characteristics and stream structure independently influenced how far microplastics travel before settling, with implications for estimating fluxes to the ocean.
Understanding how sediment movement affects microplastic deposition in sandy streambeds: A modeling study.
Researchers used a numerical model of flow and particle transport in moving streambed sediment to quantify how streambed motion affects microplastic deposition and accumulation, running simulations across streamwater velocities of 0.1-0.5 m/s and varying median grain sizes to examine MPs of all sizes and densities.
Markovian Models for Microplastic Transport in Open‐Channel Flows
Markovian statistical models were developed to describe how microplastic particles move through rivers and streams, capturing both active transport and temporary deposition behavior. The models were compared against experimental data and found to accurately represent particle movement patterns. Better transport models are essential for predicting how microplastics spread from rivers to the ocean.
Investigations into the effects of biofilm formation on the transport behavior of microplastics in open channel flows
Researchers found that biofilm growth on low-density polyethylene microplastics significantly increases their settling propensity in open-channel flow, with biofilm-colonized 100 µm PE particles showing greater vertical movement than uncoated polyester particles despite PE's lower inherent density.
Transport and accumulation of plastic particles on the varying sediment bed cover: Open-channel flow experiment
Researchers conducted open-channel flow experiments to study how various plastic particles of differing shape, size, density, and flexibility are transported and retained across sediment beds of varying grain size, finding that friction-driven retention zones consistently form at boundaries between finer and coarser sediments, offering a mechanism to explain the patchy distribution of microplastics in seafloor sediments.
Plastic drift : Mapping the course of microplastic transport in turbulent riverine flows.
Researchers investigated the transport dynamics of 24 negatively buoyant microplastic particles across a spectrum of sizes, shapes, and densities using a 3D particle tracking system in turbulent open channel flow, generating 720 trajectories. They found that particle shape was the dominant determinant of transport behavior, with fibers tending to remain near the water surface at lower forward velocities while spheres stayed closer to the bed with higher forward velocities.
On some physical and dynamical properties of microplastic particles in marine environment
This study examined the physical and dynamical properties of microplastic particles in marine environments, using modeling to predict how particle shape, density, and size govern transport, dispersion, and accumulation patterns.
Microplastic and natural sediment in bed load saltation: Material does not dictate the fate
Researchers investigated how microplastics move as bed load in river flows and found that transport behavior in saltation was governed primarily by particle size, shape, and density rather than material composition, suggesting that microplastics follow similar transport mechanics as natural sediment.
Microplastics Transport in Turbulent Flow: Investigating the Effects of Physical Characteristics and Flow Dynamics
This PhD dissertation investigated how the physical properties of microplastics — density, size, and shape — affect their transport and mixing in turbulent aquatic flows using numerical simulations and experiments. Lower-density, smaller, and non-spherical particles deviate most from fluid streamlines, explaining why these types are found far from their sources.
Response of microplastic particles to turbulent flow: An experimental study
Using controlled flume experiments, researchers studied how turbulent flow conditions affect the transport and settling behavior of microplastic particles with varied shapes and densities, finding that turbulence intensity and particle morphology interacted to determine suspension and deposition patterns.
Design of model microplastics to study their transport in urban waters
Researchers designed model microplastic particles with controlled physical properties to systematically study their transport behavior in urban water systems. The work provides a foundation for understanding how microplastic size, density, and shape influence fate and transport in stormwater and urban drainage networks.
Direct numerical simulation of the distribution of floating microplastic particles in an open channel flow
This study used direct numerical simulation to model the three-dimensional distribution of floating microplastic particles in open channel flow, providing quantitative predictions of how particle buoyancy, size, and turbulence interact to control microplastic concentration profiles in rivers.
Mobility and retention of microplastic fibers and irregular plastic fragments in fluvial systems: an experimental flume study
Researchers conducted experimental flume studies to compare the mobility and retention of microplastic fibres and irregularly shaped plastic fragments in fluvial systems. The study found that particle shape strongly influences transport behaviour, with fibres exhibiting greater mobility and distinct retention patterns compared to irregular fragments, highlighting the need to move beyond spherical particle models in microplastic transport research.
Understanding the dynamics of microplastics transport in urban stormwater runoff: Implications for pollution control and management
Researchers modeled how microplastics travel through urban stormwater runoff into water bodies. They found that a microplastic's shape, size, and density strongly influence whether it settles or floats during transport, and that local factors like street slope and surface friction significantly affect how quickly particles reach storm drains. The findings could help cities design better stormwater management strategies to capture microplastics.